'Sunglasses? Indoors?': watch the new Doctor Who Christmas special trailer

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The latest trailer for the Doctor Who Christmas special, titled Twice Upon a Time, has arrived and sees the First Doctor and the Twelfth exchanging quips.

"Sunglasses?" asks the First.

"They're sonic," replies the current incarnation.

"Indoors?" comes the incredulous response.

This Christmas marks the biggest change that Doctor Who has seen for almost a decade. Not only will there be a new Doctor arriving, as Peter Capaldi makes way for Jodie Whittaker, but showrunner Steven Moffat – who has manned the ship since David Tennant regenerated into Matt Smith in 2009 – also departs and Broadchurch's Chris Chibnall picks up the mantel.

The first trailer for the Christmas special was released back in July, after the 10th series finale, and confirmed that companion Bill Potts (Pearl Mackie) will return for one final episode and team up with the two Doctors, who are stranded in a frozen moment in time.

They will face the mysterious Glass People, who use the moment to steal their victims and target a First World War captain (Mark Gatiss) who had been destined to die on the battlefield.

That trailer was followed by a preview clip in November, which saw the First Doctor enter the current Doctor's TARDIS for the first time. The episode will also feature the original TARDIS, with its white, circular decor.

As a treat for northern English fans, ahead of the Christmas Day transmission, the episode will be shown on big screens at venues in Hartlepool, York, Hull, Newcastle, Middlesbrough, Salford, Durham and Bradford between December 14 and December 22.

Doctor Who: Twice Upon a Time is on BBC One at 5.30pm on Christmas Day